One of the richest and largest markets in the world, Europe can set global standards. And if a French president is prepared to at least consider clear rules in the Eurozone, then it would be fatal if Germany were not to react.

Referendums have always posed a threat when it comes to EU policy, because EU policy is complicated. They're an opportunity for those from all political camps who like to oversimplify things.

Imagine a German as president of the European Commission. If he or she goes to some particular country and says do this or that, it won't be very well received. The president quickly ends up being the evil German. But if the president is elected by and controlled by 700 representatives from all EU countries, that legitimizes him or her in a very different way.

In the days before the vote, I bet that the British would stay in the EU.

The EU is a community of values, not military buildups.

My worry is that Donald Trump may inspire copycats, also in Europe. That's why I hope Hillary Clinton wins.

The membership survey was a great moment for inner-party democracy. We can't go back, nor do we want to. Our members are pouring their hearts into this campaign. But people don't join the Social Democrats party just to put up posters. They join because they want to help steer the party.